CVE-2026-7774tarfile.data_filter path traversal bypass allows writing outside the extraction directory
Updated under an hour ago ()
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It affects Python Software Foundation CPython. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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tarfile.data_filter could be bypassed using crafted link entries, including symlinks with empty or directory-like names, to redirect later archive members outside the intended extraction directory. This allowed a malicious tar archive to cause tarfile.extractall() to write files outside the destination directory, subject to the permissions of the extracting process.
- CVSS
- 6.9 MEDIUM (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
- Weakness (CWE)
- CWE-22
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- PSF
- NVD analysis
- Awaiting Analysis
- Record last updated
- Aug 12, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Python Software Foundation CPython python_software_foundation:cpython (from the name) | before 3.10.21; from 3.11.0 before 3.11.16; from 3.12.0 before 3.12.14; from 3.13.0 before 3.13.14; from 3.14.0 before 3.14.6; from 3.15.0a1 before 3.15.0b2 | CNA record |
References
- https://github.com/python/cpython/pull/149487patch
- https://github.com/python/cpython/issues/149486issue-tracking
- https://mail.python.org/archives/list/security-announce@python.org/thread/4FU62L2M6RMMHT2QPGQNPEHHUND7CEX5/vendor-advisory
- https://github.com/python/cpython/commit/0478bd83d82b255e0f29f613367a59d261e7eaa2patch
- https://github.com/python/cpython/commit/0d28f5e46e151718972dfabd91205444d0037b6dpatch
- https://github.com/python/cpython/commit/578411982c16f753f4893532510099ef665117dapatch
- https://github.com/python/cpython/commit/5cf47a248c35c375d610b87b2f72fd1ed454b558patch
- https://github.com/python/cpython/commit/74cca9a92fb7d653e404843a56b8bdc7b0afdbbfpatch
- https://github.com/python/cpython/commit/10a13bee3c24f9c62b602e696334ff2272a40efcpatch
- https://github.com/python/cpython/commit/c063191cb7f9170f9565e305f8aa2b79ab2bf609patch
- http://www.openwall.com/lists/oss-security/2026/06/04/9
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.